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A new lawsuit filed against the federal Environmental Protection Agency accuses the agency of penalizing refiners for failing to meet “unattainable and absurd” cellulosic biofuels quotas outlined in EPA’s renewable fuels standard.

The EPA mandates the purchase of biofuels formulated in part from materials including switchgrass, wood chips and agricultural waste. But the American Petroleum Institute argues that the quotas set an unrealistic goal because no such cellulosic biofuels are produced on a commercial scale in the nation.